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Some constraints were missing, some constraints were too coarse.
Also, switched to using [FixSolver] instead of a home-made system.

Tested it by using to compute the FOLLOW sets.

The old comment was wrong, I think.

so it works even if GNUmakefile is present.

uninstall) to work regardless of whether we are in a distributed package or in
the repository.

a parser produced by menhir --table cannot be linked with an incorrect
version of MenhirLib.

so that the demos can be built properly, and uninstalls it
afterwards. Also, it checks that MenhirLib is not initially
installed already.

make local: transmit PATH.
make unlocal: new feature.